【導(dǎo)讀】standardmethods.weakeningarefound.

　　

【正文】 of the building, or load bearing wall that is close to an independent load bearing brick column, requirement for load bearing of the concerned wall body shall be higher than usual. When checking putation is used for a multibuilding block house for second class appraisal with the method of prehensive index of earthquake resistance capability, based on the situation how the house condition contradicts with the first class appraisal, the method of index of house story average earthquake resistance and the method of index of house story prehensive earthquake resistance respectively. Index of building story average earthquake resistance, index of building story prehensive earthquake resistance and index of wall section prehensive earthquake resistance shall be calculated according to both of longitudinal and latitudinal direction respectively. When the weakest index of each of the three is lower than , reinforcement and/or other measures shall be taken for the house. Reinforced concrete House Standard of appraisal for construction earthquake resistant GB5002395 when building block structure links to or relies on a shell frame structure, earthquake reaction borne by the building block structure should be enhanced。 appraisal for the shell frame structure shall be calculated bing with the unfavorable effect resulted from linkage between the two different structures. Nonstructural structures such as brick parapet wall, door face and small rooms that extrude outside of house roof shall meet specified rules. Structure system of existing house shall meet the following rules: Swing joint shall not be used for shell frame structures that are of degree 8 and degree 9. For beams, columns and walls of degree 8 and degree 9, the concrete strength shall not be lower than C18. For sites of category I and category II, degree 8 and 9, the shell frame shall meet the designing requirement of nonearthquake resistance, of which the anchoring length of longitudinal beams in the column shall not be smaller than 25 times of diameter of the longitudinal reinforcing bar for I class steel, 30 time for II class steel. When concrete strength class is C13, the anchoring length shall be increased by 5 times of diameter of longitudinal steel bar. Furthermore, category III and IV sites of degree7 and walls of degree 8 and degree9 shall meet the following requirement as well: Closing rings of beams and columns shall meet the following requirements: (1) Within 1/6 of the height of column its at the upper and lower ends diameter of the ring — 11 — bar shall not be smaller than ф 6 and space no more than 200mm for degree 8, and no smaller than ф 8, no more than 150mm space for degree 9. (3) For columns whose ratio between height and height of crosssection no more than 4, including the short column formed due to clay brick fillings, the diameter of close ring bar along the whole height range shall not smaller than ф 8。 for space between ring bars no more than 150mm and 100mm for degree 8 and degree 9 respectively. When load is borne by gable wall in a shell frame structure, the gable wall shall have wall columns made of reinforced concrete, which shall be reliably connected to the shell from beams. It not, it must be reinforced for degree 8 and degree 9 structures. For reinforced concrete houses, The following index of plane structure house story prehensive earthquake resistance capability shall be adopted for the second class appraisal. In general, typical plane structures may be selected as representative ones from two main axial directions. When a shell frame structure is to be connected to a load bearing building block, in addition to meeting the above requirements, the plane structure at connection location shall yet to be considered。 when there is significant torsion, in addition to meeting the above requirements, the torque affected edge side load bearing structure shall also be considered. Houses with internal shell frame and bottom shell frame Standard of appraisal for construction earthquake resistant GB5002395 Structure system of existing houses shall meet the following rules: The maximum distance between earthquakeproof latitudinal walls shall meet the rules in table , if not, corresponding measures shall be taken: Maximum distance between earthquakeproof latitudinal walls table type of house 6 degree 7 degree 8 degree 9 degree first floor of brick house with bottom shell frame 25 21 19 15 first floor of brick house with bottom internal shell frame 18 18 15 11 brick house with multirow column internal shell frame 30 30 30 20 brick house with single row internal shell frame 18 18 15 11 For the first floor shell frame and the first floor of a brick house with an internal shell frame, earthquakeproof walls made of concrete or bricks shall be equipped in both longitudinal and — 12 — latitudinal directions. Also, the ratio between rigidity of the first floor and rigidity of the second floor at each direction shall be controlled. For the first floor of brick house with first floor shell frame and the first floor internal shell frame, and with multifloor internal shell frame, thickness of brick earthquakeproof walls of shall not be less than 240mm, actual strength degree of brick shall not be lower than . For actual strength of mortar for brick lying shall not be lower than (for degree 6 and 7) and M5 (for degree 8 and 9). Entire connection structure of existing house shall meet the following rules: For the first floor of brick house with first floor shell frame and first floor internal shell frame, for degree 8 and 9, the roof shall be sitepoured concrete or assembled concrete elements。 for degree 6 and 7, ring beam(s) shall be equipped for assembled element structure. If not the case,