实务重点（Practical focus）.docVIP

实务重点（Practical focus） practice 1. classification of loads: according to the variation of time, classified into permanent load, live load and accidental load. According to the response of the structure, it can be classified into static action (snow load, floor live load), dynamic action (earthquake action, crane equipment action, high altitude falling object pounding action) According to the size of load surface, it can be divided into cloth load, line load and concentrated load. (PI.P2) 2. design life: a class (temporary structure for 5 years), two (25 years to replace the structure) and class three (50 years of ordinary houses and buildings), four class (100 year memorial buildings and particularly important buildings). (P7) 3. the minimum concrete strength of prestressed concrete members shall not be less than C40. (P8) 4. the thickness of concrete protection layer of longitudinal stress steel bar in foundation is not less than 40mm, and should not be less than 70mm (P9) when there is no cushion 5., there are many factors affecting the failure modes of oblique section, such as section size, concrete grade strength, load form, stirrup and bending reinforcement content, among which the stirrup ratio is the most influential. (P9) 6. both sides of expansion joint should be provided with bearing wall, the foundation can not be separated, and the foundation with settlement joint must be separated. (P14) 7. layers of civil buildings or high classification; one to three floors for residential floor, four layers to six layers of multi-storey residential, seven to nine floors in high-rise residential buildings, ten floors and ten floors above residential high-rise residential buildings: in addition to the residential and building height of not more than 24 meters for single layer buildings and multi-storey buildings, more than 24 meters of high-rise building; building height more than 100 meters of high-rise civil building construction; (p16) 8 indoor sound environment (a)