Most of this difference reflects the evolutionary expansion of the neocortex in humans particularly the association cortex. Once hed corrected the measurement for their smaller body sizes chimpanzees did turn out to be stronger than humans.

Scientists Have Finally Figured Out Why Chimps Are So Damn Strong
Chimpanzewe body measurement. Baby chimpanzees have very pale skin in the areas that have no hair and a white tuft of hair on the rump. Short communications 2 3 full title. Chimpanzees are covered with black hair on most of their body except their fingers palms armpits and bottoms of their feet. Chimpanzees have brains that are one third the size of human brains. Females chimpanzees can give birth at any time of year. Chimpanzees can walk on two legs for a brief period being more common in bonobos.
Chimpanzees vary considerably in size and appearance but they stand approximately 117 meters 355 feet tall when erect and weigh about 3260 kg 70130 pounds. Later studies suggested they could only pull two to four times their weight. 816 mm m f body weight. An adult male chimp he found pulled about the same weight as an adult man. 4 non invasive body temperature measurement of wild 5 chimpanzees using faecal temperature decline 6 7 siv aina jensen1 3 roger mundry1 charles l. Chimpanzee species of ape that along with the bonobo is most closely related to humans.
A murdered chimpanzee his body beaten bloodiedand partially cannibalizedby the community he used to lead. It is easy to note the similarities between the anatomy of a human being and that of a chimpanzee. It was a grisly sight. 40 to 60 kg m 32 to 47 kg f. 8 leendertz12 9 10 1 max planck institute for evolutionary anthropology leipzig germany. By a 1923 study that claimed one chimp could pull nine times its own body weight.
Chimpanzees have very long arms the arms are longer than the legs and a short body. Body weight cranial capacity linear and joint area data from ten free ranging adult chimpanzees from gombe national park tanzania with known life histories allow study of variation in a local. Nunn14 christophe boesch1 and fabian h. 1 1 running heading. Chimpanzees do have stronger. Males tend to be larger and more robust than females.
But the latter have unique characteristics like its robust and sturdy body several times more than that of a person.