【正文】 gn showing that the element is yielded, cracked, loosen or drawn off. 3) Uneven sink of the construction (differential sink) is already more than the permitted sink difference that is specified in the existing specification for earth foundation designing。 for earthquakeproof structure, it may be one degree higher than normal, excluding that is 9 degree. Category C: Both checking putation for earthquake resistance and structure shall be in accordance with the requirement of earthquake resistance defensive intensity. Category D: At 7~9 degree, requirement of checking putation may be lower and earthquakeproof structure may be lowered by one degree. It is not necessary to do appraisal for those lower than 6 degree. General rules Standard for appraisal for construction GB 5002395 Appraisal for earthquake resistance of the existing construction shall include the following content and requirement: The initial information such as survey report, construction drawings, finishing drawings, and documents for acceptance of the project shall be collected。 (2) Mass center and rigidity center of floor are basically coincide or very close to each other. Actually reached strength brick, building block and mortar of load bearing wall shall meet the following requirements: When strength of mortar used for laying wall bricks is of 6 or 7 degree, building block at or under the third floor shall not be lower than . The connection entirety of existing house structure shall meet the following rules: Connection between vertical and horizontal planes shall be reliable. If this requirement is not met, measures for reinforcement or other method shall be taken: (1) The wall body in one plane shall be closed。 when there are structural columns made of concrete, steel reinforcing bars of 2ф 6 shall be inserted into horizontal brick seams with an interval of every 10 layers。 Requirement for arrangement of ring beam of house, of witch the vertical wall is for load bearing, shall be increased accordingly。 the horizontal space of ring beans at internal walls of 7 or 8 degree shall not be higher than that of 8 degree and 9 degree respectively specified I table 。 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。 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